Suppose contact lenses cost $300 for a year supply or $30 for a month's supply which is less expensive to order per year paying for 12 months at one time or paying for one month at a time

To determine which option is less expensive, we need to calculate the total cost for each scenario.

1. Ordering per year:
The cost for a year supply of contact lenses is $300.
Total cost for the year: $300

2. Ordering per month:
The cost for a month supply of contact lenses is $30.
Total cost for one year (12 months): $30 x 12 = $360

Comparing the two options:
- Ordering per year: $300
- Ordering per month: $360

Therefore, ordering per year is less expensive, as it costs $300 compared to the $360 cost for ordering per month.

To determine which option is less expensive, let's calculate the total cost of each option:

Option 1: Ordering a year supply for $300
Total cost for the year = $300

Option 2: Ordering a month's supply for $30 per month, paying for one month at a time
Total cost for the year = 12 months x $30 per month = $360

Comparing the total costs of both options, we can see that ordering a year supply for $300 is less expensive than paying for one month at a time, which would cost $360 per year. Therefore, ordering the year supply at once is the more affordable option.

To determine which option is less expensive, we need to compare the cost of ordering a year's supply at once versus paying for one month at a time.

To calculate the cost of ordering a year's supply at once, we multiply the cost of one month's supply by 12 months:

Yearly cost = 12 * (cost of one month's supply)

Yearly cost = 12 * $30 = $360

Alternatively, if you pay for a year's supply at once, it costs $300 per year.

Comparing the two costs:

- Paying for one month at a time: $30 per month
- Paying for a year at once: $300 per year

In this scenario, paying for a year's supply at once for $300 is less expensive compared to paying for one month at a time, which would amount to $360 in total.